distributed-computing/tasks/melnikov-ky/lab_5/Lab5/Alg2.cs

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2023-12-18 16:46:40 +04:00
namespace Lab5
{
public class Alg2
{
public int[,] Begin(int[,] matrix1, int[,] matrix2, int numThreads)
{
int rowsA = matrix1.GetLength(0);
int columnsA = matrix1.GetLength(1);
int rowsB = matrix2.GetLength(0);
int columnsB = matrix2.GetLength(1);
int[,] resultMatrix = new int[rowsA, columnsB];
int rowsPerThread = rowsA / numThreads;
Thread[] threads = new Thread[numThreads];
for (int i = 0; i < numThreads; i++)
{
int startRow = i * rowsPerThread;
int endRow = (i == numThreads - 1) ? rowsA : startRow + rowsPerThread;
threads[i] = new Thread(() => MultiplyRows(startRow, endRow, matrix1, matrix2, resultMatrix));
threads[i].Start();
}
foreach (Thread thread in threads)
{
thread.Join();
}
return resultMatrix;
}
static void MultiplyRows(int startRow, int endRow, int[,] matrixA, int[,] matrixB, int[,] resultMatrix)
{
for (int i = startRow; i < endRow; i++)
{
for (int j = 0; j < matrixB.GetLength(1); j++)
{
int sum = 0;
for (int k = 0; k < matrixA.GetLength(1); k++)
{
sum += matrixA[i, k] * matrixB[k, j];
}
resultMatrix[i, j] = sum;
}
}
}
}
}